SU1612179A1 - Method of automatic control of feed pulverulent coal to burners - Google Patents

Abstract

The purpose of the invention is to improve the accuracy of maintaining the temperature of the medium and the metal along the boiler steam duct when the primary air flow rate varies with variable loads. This is achieved by varying the flow rate of the primary air with a pressure gauge 10 and measuring the pressure in the primary air box 11, which can vary with the position of the gate 13, which regulates the flow of primary air from the fan 12, to the burners. They form a signal by pressure and with this signal they compensate signals by the temperature of the air mixture measured by thermal sensor 9, and at variable loads the fuel supply is changed by individual regulators 3 only according to the setting of common fuel regulator 1. 1 il.

Description

Azromix

to mountain / go

i The invention relates to heat and power engineering and industrial heat engineering, in particular to the management of boiler units in which coal dust is transported to the main airways and each dust collector is equipped with an individual actuator to change the capacity.

I The purpose of the invention is to improve the accuracy of maintaining the temperature of the working medium and the metal along the boiler steam line when the primary air flow rate changes at variable loads.

The drawing shows the implementation of the method of automatic control of the supply of pulverized fuel to the burner of the boiler.

The scheme consists of a common fuel regulator 1 to the boiler (or housing), 2 signal multipliers, individual fuel regulators 3 to each burner, actuators 4, regulators 5 that change the flow of dust from the dust collectors 6 to the primary air dust pipes 7 intermediate dust bin 8, temperature sensors 9, pressure gauge 10 to measure the pressure in the duct And the primary air, which changes when the operator of the power unit changes the position of the guiding device 13 of the blower fan 12 to bring the boiler to a predetermined level Hb load in accordance with the restricted card. The method is carried out as follows.

Using the fuel regulator 1 common to the boiler (or housing), through the multiplier 2 signals, control the setting of the individual fuel regulators 3. The controllers 3 maintain the specified performance of each dust collector 6 with the help of actuators 4 and regulatory bodies 5 by the mismatch between the driver signal of the controller 1 and the signals of thermal sensors 9 installed in each dust pipe beyond the zone of coal dust displacement with the transporting primary air. The application of a pressure signal in the primary air duct 11 from the pressure gauge 10 significantly changes the algorithm for the operation of the regulator 3.

The use of the air pressure signal from the pressure gauge 10 makes the fuel regulators 3 combined. Without this signal

With a sudden change in pressure in the duct due to a change in the primary air flow rate as the load on the boiler changes, the temperature of the air mixture quickly changes and the fuel regulator also changes its supply to the boiler. According to the method, with the indicated disturbances, the signals of the change in the temperature of the air mixture in the dust lines to the burners and the air pressure in the primary air box compensate each other.

and individual regulators, therefore, change the fuel supply only by a signal from the general fuel regulator, which maintains the temperature of the vapor-water medium before the injections. Thus setting

The 5 signals from the pressure gauge 10 are selected so that the regulators 3 change the fuel supply according to the setting of the common regulator 1, i.e. only by the deviation of the temperature of the working medium in the steam-water duct of the boiler, which ensures more accurate maintenance of the temperature of the medium and the metal along the steam-water duct.

Claims (1)

Invention Formula 5 A method of automatically controlling the supply of coal dust to the boiler burners, which consists in measuring the temperature of the working medium in the boiler steam channel and forming over this temperature with a common fuel regulator setting the individual fuel regulators to each burner, measuring the air mixture in dust lines to each burner, generate signals based on the temperature of the air mixture and change the fuel supply to each burner with individual regulators, 5 maintaining the temperature of the air mixture in the dust pipes in accordance with the task of the general regulator, characterized in that, in order to increase the accuracy of maintaining the temperature of the working medium and the metal along the boiler steam line when the primary air flow rate varies with variable loads, the pressure in the duct the primary air, at this pressure, they form a signal that compensates the signal by the temperature of the air 45 mixtures at variable loads, and change the fuel supply with individual regulators to variable loads only on the instructions of the general fuel regulator.